a car slows down from a speed of 25 m/s to rest in 5.0 seconds fine the acceleration during this time period
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Answer:
A freely falling object have fallen from a position of rest when its instantaneous speed is 10 m/s, it will travel 5.102 meter.
Explanation:
We have equation of motion, , where u is the initial velocity, u is the final velocity, s is the displacement and a is the acceleration.
In this case we have final velocity = 10 m/s, initial velocity = 0 m/s, and acceleration = 9.8 .
Substituting
A freely falling object have fallen from a position of rest when its instantaneous speed is 10 m/s, it will travel 5.102 meter.
Final answer:
When an object, starting from rest, achieves an instantaneous speed of 10 m/s while freely falling under gravity, it will have fallen approximately 5.10 meters.
Explanation:
Using the physics concept of motion under gravity, where the first equation of motion can apply (v = u + gt), your question involves finding the displacement of a freely falling object starting from rest until it reaches a speed of 10 m/s.
In this case, initial velocity (u) is zero because the object was at rest, the final velocity (v) is 10 m/s, and g is the acceleration due to gravity which is approximately 9.81 m/s².
We could rearrange the equation to find time: t = v/g = 10 / 9.81 ≈ 1.02 s. Then, we employ the second equation of motion to find the distance fallen, s = ut + 0.5gt². Since u=0, the formula simplifies to s = 0.5gt². Substituting g = 9.81 m/s² and t = 1.02 s into the equation yields s = 0.5 * 9.81 * (1.02)² ≈ 5.10 m.
Therefore, a freely falling object will have fallen approximately 5.10 meters when its instantaneous speed is 10 m/s.
Learn more about Free Fall Motion here:
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B.With just two second left on the clock, the basketball player moved quickly down the court to sink the ball in the basket.
C.The skier traveled downhill along the 80-meter track to the finish line in just 3.5 seconds to win the competition.
D. After traveling at 120 kph for the entire 30-minute race, the racecar driver ended the race at the same point she started.
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but I also have problems with 'C'.
In order to describe velocity, you need a speed and its direction.
'A' doesn't state either one.
'B' says "quickly", which I don't accept as a speed, and "down the court",
which I don't accept as a direction.
'D' nicely describes the speed ... 120 kph. But the only thing it
tells us about direction is that it must have changed during the
race, because that's the only way the driver could have ended
the race in the same place she started it from.
'C' gives us the skier's speed ... (80 meters) / (3.5 sec) = 22.86 m/s .
It also tells us that his direction was always downhill and along the track.
I would have preferred a better description of the direction, but I can
have it if I'm willing to go there and measure the direction of the track
and the slope of the hill. So it's all there in this choice, but you have to
dig for it.
the answer is choice C i took the test and i got it right good luck